A lot depends on how far you have to lift the hitch, lifting the hitch and truck to the level the truck was before the trailer was hooked up is only the same as a no truck attached lift, every bit you have to raise past that to get the bars hooked up increases the load . I'd guess at 2500 lbs for your 1/2 ton but if you trade trucks, to say a 3/4 ton, before you trade trailers you might need more. Buying a heaver duty one now is cheeper than buying a second one later.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.